A fundamental study of leaching kinetics and mechanisms of molybdenite …
— Furthermore, a conceptual hydrometallurgical treatment process for molybdenite concentrate was proposed, aiming to recover molybdenum, sulfuric acid, and copper. ... The effect of silver on the acidic ferric sulfate leaching of primary copper sulfides under recycle solution conditions observed in heap leaching. Part 4: Semiconductor …
Direct oxidative pressure leaching of bismuth sulfide concentrate …
— Section snippets Materials. Bismuth sulfide concentrate, the raw material, was produced by the flotation process in Chenzhou, Hunan, China. Prior to starting the leaching experiments, the bulk concentrate was milled, crushed and ground to make 90% of the feed particle size less than 15 μm.
Kinetics of copper dissolution in the purification of molybdenite …
DOI: 10.1016/J.HYDROMET.2013.05.012 Corpus ID: 97794733; Kinetics of copper dissolution in the purification of molybdenite concentrates by sulfidation and leaching @article{Padilla2013KineticsOC, title={Kinetics of copper dissolution in the purification of molybdenite concentrates by sulfidation and leaching}, author={Rafael Padilla and Hugo …
Rhenium extraction from pressure oxidative leaching …
— Re-bearing solution is usually obtained from roasting fume/dust, leaching residue, and pregnant leaching solution (PLS) [10]. Re could be recovered during the roasting process of molybdenite concentrates from wet scrubbing liquors as perrhenic acid (HReO 4) [[2], [6]]. The supply, the extraction and recycling of Re have received a much ...
Molybdenite Concentrate Purification by a Continuous …
— In order to reduce the copper content, molybdenite concentrates are generally leached with a ferric chloride solution (Brenda process) or cyanided, although …
A fundamental study of leaching kinetics and mechanisms of molybdenite …
— Kinetics of pressure oxidative leaching of molybdenite concentrate by nitric acid. Hydrometallurgy, 111 (2012), pp. 52-57. View PDF View article View in Scopus Google Scholar. Kruesl, 1972. ... Sulphuric acid leaching of mechanically activated copper sulphidic concentrate. Miner. Eng., 24 (2011), pp. 1713-1716.
Comprehensive Electrochemical-Chemical Study of …
The application of leaching processes for molybdenite separation and purification from porphyry copper deposits represented slow leaching kinetics because of the presence of …
Copper removal from molybdenite concentrate by sodium dichromate leaching
— Molybdenite flotation concentrate was leached with sodium dichromate–sulfuric acid solutions in order to remove the copper sulfide impurities. The experimental results indicated that the temperature has a large influence on the copper dissolution. The concentration of dichromate has also a pronounced effect for …
Selective copper dissolution during bioleaching of molybdenite concentrate
— Copper content of the concentrate was 0.83 wt.% as chalcopyrite. The tests showed selective dissolution of copper (chalcopyrite) from molybdenite concentrate. Up to 65% of copper content of molybdenite concentrate was removed via bioleaching with a native strain of A. ferrooxidans in less than 15 days. Ferrous sulfate, sulfur or pyrite was ...
Copper Removal from Molybdenite by Sulfidation-Leaching Process …
The process involves a sulfidation of the molybdenum concentrate with 82(g) at 380 °C followed by a leaching stage. H 2 SO 4-NaCl-O 2 leaching of a sulfidized concentrate containing 3.4% Cu for 90 min at 100°C produced a molybdenite concentrate with less than 0.2% Cu, which is appropriate for marketing. Molybdenite dissolution was negligible ...
Preparation of sodium molybdate from molybdenum concentrate …
— The preparation process of sodium molybdate has the disadvantages of high energy consumption, low thermal efficiency, and high raw material requirement of molybdenum xide, in order to realize the green and efficient development of molybdenum concentrate resources, this paper proposes a new process for efficient …
Molybdenum removal from copper ore concentrate by
— The removal of molybdenum from a copper ore concentrate by sodium hypochlorite leaching was investigated. The results show that leaching time, liquid to solid ratio, leaching temperature, agitation speed, and sodium hypochlorite and sodium hydroxide concentrations all have a significant effect on the removal of molybdenum.
Recent progress on research of molybdenite flotation: A …
— Molybdenite in porphyry ores is a byproduct of copper concentrate, therefore it is more reasonable to establish both the grinding size and the flotation scheme for copper minerals. [8] Fig. 19 (a) [ 13 ] displays the average size by size recovery of molybdenum and copper for 18 months in the Bingham Canyon mine.
Remove Copper from Moly by Ferric Chloride Leaching
— The Anaconda Minerals Company operates a molybdenite and copper producing mine and mill facility near Tonopah, Nevada. Included with the milling facility is a ferric chloride leach plant for removal of copper mineralization from the molybdenite concentrates. ... The concentrate leaching system consists of the unleached concentrate …
Kinetics of copper dissolution in the purification of …
— The proposed method of sulfidation and leaching can be used effectively for the removal of copper from molybdenite concentrates when the copper impurity is in the form of refractory chalcopyrite mineral, which is the case for the majority of Chilean …
The selective leaching and separation of molybdenum from …
— The grade of copper in the residue was 21.84%, with a recovery 99.93%. The technology of selective electro-oxidation leaching of molybdenum and recovery of copper from complex molybdenite concentrate is an effective separation method. The diffusion control model can be used to describe the process of leaching of molybdenum.
Removal of Copper from a Molybdenite Concentrate by Chloride Leaching
— About 94% of copper was removed at 80°C after 120 h of leaching with a residual copper content of 0.46% which meets the commercial requirements for molybdenite concentrates.
Kinetics of copper dissolution in the purification of …
— In this study, the selective dissolution of copper and iron from the molybdenite (MoS 2) concentrate consisting of chalcopyrite and pyrite by acidic sodium …
(PDF) Kinetics of Copper Removal from Sulfidized Molybdenite …
Since the chalcopyrite-reacted products in the sulfidized molybdenite concentrate are essentially a mixture of covellite and pyrite, the main leaching reactions occurring concerning copper during the pressure leaching will be[13,14] CuSðsÞ þ 0:5 O2 ðgÞ þ H2 SO4 ¼ CuSO4 ðaqÞ þ S ðsÞ þ H2 OðlÞ ½2 CuS þ 2O2 ðgÞ ¼ CuSO4 : ½3 ...
Molybdenite concentrate cleaning by copper sulfation …
— A copper sulfation reaction from a molybdenite concentrate (42%Mo and 3.6%Cu) was conducted with sulfuric acid by microwave heating (190–240C) in a batch-type process at ambient pressure. A minimum energy consumption of about 0.9 (MWh/ton) was required to decrease the copper content of the molybdenite concentrate from 3.6% …
Selective dissolution of copper and iron from molybdenite concentrate
— In this study, the selective dissolution of copper and iron from the molybdenite (MoS 2) concentrate consisting of chalcopyrite and pyrite by acidic sodium nitrate leaching has been investigated to improve the quality of molybdenite.The influence of various leaching parameters, namely sodium nitrate (NaNO 3) and sulfuric acid (H 2 SO 4) …
Molybdenite Concentrate Purification by a Continuous Sulfation-Leaching
— Purification of molybdenite concentrate from copper concentrates was performed by sulfation. The sulfation of molybdenite concentrates was carried out with pure sulfuric acid (> 96%) at 160–190 °C to study the influence of the reaction temperature and reaction time on the residual copper in the molybdenite concentrates. A purified …
Silver-catalyzed bioleaching of copper, molybdenum and …
— The effect of silver on the mesophilic bioleaching of the molybdenite concentrate was tested in the range of 0–1000 mg Ag l −1, added as AgNO 3.Selective results are shown in Fig. 1 as examples of changes over time in pH, redox potential, cell counts and the leaching of Cu, Mo, and Re with 0, 120, and 1000 mg l −1 Ag addition.. …
PROCESSING OF COPPER-CONTAINING MOLYBDENITE …
ide. To achieve this objective, the process of roasting of molybdenite concentrate was studied in the wide range of temperatures, and sodium carbonate was tested as a roasting additive instead of sodium chloride. Materials and Procedures Study Object. To perform the study, high copper-content molybdenite flotation concentrate was used,
Kinetics of copper dissolution in the purification of molybdenite …
— Copper and iron elimination from molybdenite concentrate by sulfidation and leaching of the sulfidized concentrate in H 2 SO 4 –NaCl–O 2 media. Is should be point out that the leaching solutions produced by this method could be treated by the conventional solvent extraction and electrowinning technology to produce copper cathodes, and the ...
Kinetics of copper dissolution in the purification of molybdenite …
— The process involves a sulfidation of the molybdenite concentrate with S 2 (g) at 380 °C followed by a leaching stage with H 2 SO 4 –NaCl–O 2. The leaching of the sulfidized molybdenite concentrate for 90 min at 100 °C dissolved 96% of the copper which yielded a final concentrate with less than 0.2% Cu. Molybdenite dissolution was ...
Molybdenum extraction from molybdenite concentrate in …
— Semantic Scholar extracted view of "Molybdenum extraction from molybdenite concentrate in NaCl electrolyte" by Zhan-fang Cao et al. ... A study on the kinetics of leaching copper-cadmium slag was carried out.The effects of acidity,solid/liquid ratio,reaction temperature,leaching time on the comprehensive leaching ratio were ...
Molybdenum removal from copper ore concentrate by
— Alkaline leaching of copper concentrate bearing molybdenite was investigated. Thermodynamic analysis of Mo-S-H 2 O and Cu-Fe-S-H 2 O indicates that alkaline leaching of copper concentrate is feasible for selective extraction of molybdenum. The oxidation mechanisms of sulfide ores in the copper concentrate were discussed …
(PDF) Processing of Copper-Containing Molybdenite …
— Copper extraction during water leaching of cinder versus roasting temperature: (a) duration -90 min, NaCl consumption -150% of the concentrate mass, (b) duration -120 min, Na 2 CO 3 consumption ...
Kinetics of pressure oxidative leaching of molybdenite concentrate …
— The effect of parameters on pressure leaching of molybdenite concentrate was studied. Complete leaching of the molybdenite concentrates was achieved in less than one hour. Mechanism of the leaching reaction was determined. The amount of the reaction activation energy was calculated. The leaching precipitates were characterized by SEM …
Molybdenite Concentrate Purification by a Continuous Sulfation-Leaching
— The basic design for an 80-t/day plant fed with 4 wt% copper molybdenite concentrate requires five backmixed reactors in series, each measuring 8 m3, operating at 190 °C and with a reaction time ...
Kinetics of copper dissolution in the purification of molybdenite …
— The leaching of the sulfidized molybdenite concentrate for 90 min at 100 °C dissolved 96% of the copper which yielded a final concentrate with less than 0.2% Cu.
Kinetics of pressure oxidative leaching of molybdenite concentrate …
— The current study was carried out to investigate the kinetics of reactions for the pressure oxidative leaching of a molybdenite concentrate in less than one hour. The effects of oxygen pressure, stirring speed, pulp density, acid concentration and temperature on the leaching rate of the molybdenum were studied.It was found that about 85% of …